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The LP-E6 batteries used in the 5DII, 5DIII, 6D, and 7D are a lot better than the BP-511A batteries used in the 5D and older xxD cameras (e.g. 20D, 30D, 40D).
in what terms they are better? I have both not one failed on me.
They last longer at any temperature. They last a lot longer at cold temperatures. I have both, too.
I've had a few generic batteries of both kinds fail, and a few OEM BP-511A fail (i.e. old age). My new 6D has objected to a few generic LP-E6 and at least one OEM LP-E6 (probably an old one). I estimate that I've gone through and/or have about a dozen BP511-A and I currently have seven OEM LP-E6, which I use for my 6D (was 5DII) and a SmallHD DP6 HD monitor.